By Helen Regan, Masrur Jamaluddin, CNN(CNN) — Indonesian rescue teams are frantically searching for scores of young students buried for two days under rubble in Sidoarjo, East Java, after their Islamic boarding school collapsed on them during afternoon prayers. Indonesian officials have warned that time is running out to reach those still alive as the mammoth rescue operation entered its third day on Wednesday. Emi Frizer, an official from Indonesia’s search and rescue agency, expressed concern over Tuesday’s 6.5 magnitude quake. Without specifying the exact number still alive, Syafii said rescue teams have managed to establish communication with several trapped people. More than 80 people managed to escape in the immediate aftermath of the collapse, and rescue teams have pulled a further 11 people from the building, Basarnas said.